Add tools for JavaScript styling

.eslintrc.js

@@ -0,0 +1,17 @@
+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+  },
+  extends: ["airbnb-base", "prettier"],
+  plugins: ["prettier"],
+  rules: {
+    "class-methods-use-this": "off",
+    "prettier/prettier": "error",
+    curly: ["error", "all"],
+    "no-console": "off",
+  },
+  parserOptions: {
+    ecmaVersion: "latest",
+  },
+};

.gitignore

@@ -3,4 +3,5 @@
 .env
 .vscode
 \.*.sw*
+node_modules
 wildcards

package.json

@@ -0,0 +1,16 @@
+{
+  "devDependencies": {
+    "eslint": "^8.2.0",
+    "eslint-config-airbnb-base": "^15.0.0",
+    "eslint-config-prettier": "^8.8.0",
+    "eslint-plugin-import": "^2.25.2",
+    "eslint-plugin-prettier": "^4.2.1",
+    "prettier": "^2.8.7"
+  },
+  "scripts": {
+    "lint": "eslint . --ext .js"
+  },
+  "prettier": {
+    "trailingComma": "all"
+  }
+}